Robert H. Lawrence, Jr. was selected as the first African-American astronaut.
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Donald Trump became the first US president to visit North Korea while meeting Kim Jong Un.
The first Chevrolet Corvette was manufactured in the US.
Charles Blondin became the first person to cross Niagara Falls by walking across a tightrope.
The world's first emergency telephone calls were accepted in London, UK.
The first leap second was added to the UTC time system.
